[BUG] fetcher_sync_sucess fails for `TheGraphFetcher`

[EvolveArt]

What happened

Once #48 is done, we can fix this test.

I couldn't find a way to correctly mock post requests depending on the body which is only a problem for TheGraphFetcher as it works with POST requests and not GET requests as other fetchers do.

Note that weirdly enough, it works in the async case.

Stack trace

fetcher_config = {'expected_result': [SpotEntry(pair_id="BTC/USD", price=3459885191309, timestamp=12345, source="THEGRAPH", publisher="...file': PosixPath('/Users/matthall/Documents/pragma-sdk/pragma/tests/mock/responses/thegraph.json'), 'name': 'TheGraph'}
mock_data = {'BTC': {'data': {'pool': {'feeTier': '3000', 'liquidity': '12133869505104', 'sqrtPrice': '147370456125399510359475624...500', 'liquidity': '20753232973335935007', 'sqrtPrice': '1867199352400732300487913333649122', 'tick': '201362', ...}}}}

    @mock.patch("time.time", mock.MagicMock(return_value=12345))
    def test_fetcher_sync_success(fetcher_config, mock_data):
        with requests_mock.Mocker() as mocker:
            fetcher = fetcher_config["fetcher_class"](SAMPLE_ASSETS, PUBLISHER_NAME)
    
            # Mocking the expected call for assets
            for asset in SAMPLE_ASSETS:
                quote_asset = asset["pair"][0]
                base_asset = asset["pair"][1]
                url = fetcher.format_url(quote_asset, base_asset)
    
                # TODO (#000): Fix this test
                if fetcher_config["name"] == "TheGraph":
                    query = fetcher.query_body(quote_asset)
                    print(query)
                    mocker.post(
                        url,
                        json=mock_data[quote_asset],
                        additional_matcher=lambda request: request.text
                        == '{"query": "' + query + '"}}',
                    )
                else:
                    mocker.get(url, json=mock_data[quote_asset])
    
>           result = fetcher.fetch_sync()
...
requests_mock.exceptions.NoMockAddress: No mock address: POST https://api.thegraph.com/subgraphs/name/uniswap/uniswap-v3

Steps to reproduce

1. poe test_ci_fetchers

SDK Version

1.0.4

Python version

3.9.13

What operating system are you using?

Mac

Is there an existing issue for this?

• I have searched the existing issues and verified no issue exits for this problem.